Ultra Low Power State
While something that will only cater to CrossFire and CrossFireX users, the idea behind this is that the second card will go into what ATI are calling a "Very Low Power State". When we're just moving around the desktop and not in games, our cards are already in a Low Power mode; this really takes it to the next level with bringing down the power of the cards outside of the main one.
This will automatically be enabled in Windows 7 and Windows Vista and you won't know that it's happening unless you look at your power draw. If you're using a CrossFire or CrossFireX setup, the chances are you're not going to be all that fussed by the feature, but it's no doubt nice to see that ATI are working towards making the technology better in one way or another.
This is something quite self explanatory really. If you're using a monitor that offers DisplayPort and speakers, you'll be able to get audio through the speakers with the DisplayPort connector.
Again, it's not a major development, but just another way of making things a bit better. While DisplayPort on a whole hasn't really taken off, it's clear that it will become the replacement for DVI in the future. There's nothing wrong with ATI jumping on the bandwagon early and implementing the technology now rather than later.